English verb conjugation
COULD QUASH

Regular verb: quash - quashed - quashed

Affirmation

Simple form	V-ing form
I could quash you could quash he could quash we could quash you could quash they could quash	I could be quashing you could be quashing he could be quashing we could be quashing you could be quashing they could be quashing
Perfect	V-ing perfect
I could have quashed you could have quashed he could have quashed we could have quashed you could have quashed they could have quashed	I could have been quashing you could have been quashing he could have been quashing we could have been quashing you could have been quashing they could have been quashing

Negation

Simple form	V-ing form
I couldn't quash you couldn't quash he couldn't quash we couldn't quash you couldn't quash they couldn't quash	I couldn't be quashing you couldn't be quashing he couldn't be quashing we couldn't be quashing you couldn't be quashing they couldn't be quashing
Perfect	V-ing perfect
I couldn't have quashed you couldn't have quashed he couldn't have quashed we couldn't have quashed you couldn't have quashed they couldn't have quashed	I couldn't have been quashing you couldn't have been quashing he couldn't have been quashing we couldn't have been quashing you couldn't have been quashing they couldn't have been quashing

Interrogative form

Simple form	V-ing form
could I quash? could you quash? could he quash? could we quash? could you quash? could they quash?	could I be quashing? could you be quashing? could he be quashing? could we be quashing? could you be quashing? could they be quashing?
Perfect	V-ing perfect
could I have quashed? could you have quashed? could he have quashed? could we have quashed? could you have quashed? could they have quashed?	could I have been quashing? could you have been quashing? could he have been quashing? could we have been quashing? could you have been quashing? could they have been quashing?

Interro-negative form

Simple form	V-ing form
couldn't I quash? couldn't you quash? couldn't he quash? couldn't we quash? couldn't you quash? couldn't they quash?	couldn't I be quashing? couldn't you be quashing? couldn't he be quashing? couldn't we be quashing? couldn't you be quashing? couldn't they be quashing?
Perfect	V-ing perfect
couldn't I have quashed? couldn't you have quashed? couldn't he have quashed? couldn't we have quashed? couldn't you have quashed? couldn't they have quashed?	couldn't I have been quashing? couldn't you have been quashing? couldn't he have been quashing? couldn't we have been quashing? couldn't you have been quashing? couldn't they have been quashing?